Figure 1. Rates of open and laparoscopic cholecystectomy by year in the Veterans Affairs system. The increase in the rate for all cholecystectomies is significant over time (P<0.001 by the chi-square test for linear trend)

Figure 1. Rates of open and laparoscopic cholecystectomy by year in the Veterans Affairs system. The increase in the rate for all cholecystectomies is significant over time (P<0.001 by the chi-square test for linear trend)